This was the fourth time that the X-37B has flown on an Atlas V launch vehicle.
The X-37B first flew in 2010, and the air force has not said when it will return from this fourth mission.
flightglobal
May 21, 2015
USAF X-37B returns to orbit
This was the fourth time that the X-37B has flown on an Atlas V launch vehicle.
The X-37B first flew in 2010, and the air force has not said when it will return from this fourth mission.
flightglobal
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